Let me see if I can translate that in to Ruby. Note that the expression isn't closed, so I'm changing it to:

  (each c (dedup (map downcase (trues [uvar _ topcolor] (keys profs*))))
    (do-stuff-with c))

which I think translates roughly to:

  keys(profs*).find_all{|prof| uvar(prof, topcolor)}.map(lambda {|str| str.downcase}).uniq.each do |c|
    do_stuff_with(c)
  end

This could be slightly off, as I'm having to guess at what some of this stuff does. It's almost as dense and no more readable.